Advanced Materials Research Vols. 368-373

Abstract: The eco-composite wall structure consists of concrete blocks，concrete frame grids , concealed frame and so on. When entering, the obvious damage phenomena appears on the eco-composite wall, the deformation coordination between the block and the frame grid, compound wall and the outer framework is broken, which brings relatively large-difficulty to establish the elasto-plastic model of structure. The rigid frame - whole bracing model of the eco-composite wall structure in elastic-plastic stage is presented based on previous study. The correctness of models is verified by experiments. Theoretical analysis and experimental results show that the rigid frame-whole bracing model giving consideration to accuracy and efficiency is applicable to structural elastic-plastic time-history analysis under strong seismic action.

Abstract: The dynamic time-history response analysis method was employed to analyze the dynamic response of composition foundation with CFG piles. The deformation and stress distribution of composite foundation of CFG piles with different length and amount of piles under seismic wave was investigated. The results reveal that the bearing and asti-deformation capacity could be improved effectively for composite foundation under earthquake loads by increasing the length and number of pile. The vertical stress of foundation soil decreases gradually with the increase of the length and number of pile. The practice shows that CFG piles provide a positive contribution to the aseismic effect of foundation soils mass. The present research can provide some references to similar projects.

Abstract: In order to study the seismic behavior of steel portal frame structures, Cyclic loading test on a 1:3-scaled model of single-story single-bay steel portal frame with tapered members has been carried out. Based on test results, hysteretic curve, skeleton curve, stiffness degradation and transverse displacement of the structure are obtained. Meanwhile, the seismic performances of the structure are analyzed from aspects of ductility, energy consumption, stiffness degradation, bearing capacity, etc. It is concluded that ductility and energy consumption capacity of this structure are poor; because of its light weight, the structure attracts little seismic load; when portal frame structure designed according to current Chinese design codes suffers from small seismic action, it has enough seismic bearing capacity.

Abstract: To study on the failure model, ductility, energy dissipation capacity, structural displacement, and stiffness of the portal frame structures on the effect of earthquake force, a pseudo-static experiment with a 1/3 scaled model has been completed. Based on the test result, though the ductility and the energy consumption capacity of the structure are poor, the requirement on aseismatic bearing capacity is satisfied, because the structure suffers the smaller seismic force as the deadweight of structure is light. Built up a finite element model according to the test specimen, then performed finite element analysis, the results showed that the finite element model can be used for seismic analysis of the portal frame.

Abstract: Thin shell structure can show interesting bi-stable behavior. As a novel deployable structure, it shows a broad application prospect in the field of aeronautics and civil engineering, etc. The thesis deduces the general constitutive equations of thin shell structure on the basis of classical laminate theory. If the layup of the composite is anti-symmetric, the results show that there exist tension-bend coupling in the deformation of the shell structure; if the layup is symmetric, there exist bend-twist coupling. For isotropic shell, it has no tension-bend and bend-twist coupling, but if made unstressed from isotropic materials it is only stable in the initial configuration, which coincides with the known conclusion.

Abstract: The mainly purpose of the paper is to investigate the slope excavation deformation of the rock slope at the deep-cutting valley under different load conditions. As an example of the rock slope at the intake of the sluice tunnel of Jinping hydropower station, whose slope deformation characteristics was system analyzed by numerical method during different construction conditions. The dead weight, rain, seism and theirs combination were involved in the numerical analysis. The numerical results could give a reference for the excavation stability of the high rock slope, and it is the basis to determine the reasonable construction method and to optimize the design of the strengthening and enhancing engineering.

Abstract: This paper presents an experimental investigation on the short composition columns reinforced with the prefabricated super high strength concrete used stone-chop(abbreviated to SHSCUS) filled with steel tubes with 1RC as reference. The experimental parameters were the concrete type inner steel tubes, and L/D ratio, steel ratio and so on. The performance of the composition columns was investigated using different diameter-to-thickness ratio of steel tubes ranging from 15 to 26.6, and different cubic strength of 126.7, 120.3, 122.4, 134.4, 125.4, 111.4, 108.6MPa of infill concrete. The experimental results showed that concrete cover falling off was prior to specimens failure, and that the design rule, as specified in current code suitable for HSC overestimate the ultimate bearing capacity, were not suitable for the case with SHSCUS. Then the hypothesis was put forward based on experimental phenomena observed, and the formula of its ultimate load capacity was suggested based on superposition method, by which the predicted values have a good coincidence with those from the experiments.

Abstract: The mechanical properties of interface between soil-macadam aggregate and anti-sliding concrete pile are very important for the reinforcement design and safety evaluation of accumulative landslide in the reservoir area of Three Gorges. Soil-macadam aggregate is a complex geomaterial whose properties are totally different with soil or rock. Based on a practical landslide suffering the influence of reservoir water level change and seasonal rainfall, a series of direct shear tests are conducted to investigate the interface mechanical properties between soil-macadam aggregate and concrete pile. Accordingly, the relationship between shear strength parameters and water contents and macadam ratios is presented. The change characteristics of mechanical properties of interface are discussed. The results indicate that shearing strength, inner friction angle and cohesion decrease with less water content. However, as the increment of macadam ratios, the cohesion will decrease gradually, but the shear strength and inner friction angle of interface decrease firstly and then increase after a critical value, the change trend obeys parabolic relation.

Abstract: This paper presents the results of a study on a joint slope deformation affecting the western slope of the GuangYang highway (YangQuan, China). Fieldwork identified the ongoing deformational process and assisted in defining its mechanisms, evolution and controlling factors. Here we discuss how to use limit equilibrium methods to calculate the behavior of slopes and to use the finite element analysis to evaluate the stability, displacements of slopes and soil-slope stabilization interaction. The finite element method with shear strength reduction (SSR) technique is explained in Phase2D. This method is effective for the prediction of the stability of slope. Based on numerical comparisons between the limit equilibrium methods and finite element method, it is suggested that the finite element method with SSR technique is a reliable and maybe unique approach to evaluate the slope stability. The paper also took into account effectiveness of the large rain and seismic load. The results of the numerical analysis are consistent with the observed slope surface evidence.

Abstract: This paper presents a novel FRP-ERBG-asphalt concrete pavement system for steel bridge decks. Based on the preliminary results of theoretical analyses and laboratory tests, this new system offers superior structural performance to conventional asphalt concrete pavement systems. Once trial tested in practice, it may well represent a new generation of reliable and economic pavement system for steel bridge decks.